Vienna is in the grip of a crime wave and Agent Muller has been sent to tackle it; not just because of his talent at solving crimes but because his superiors see him as toxic to their careers. Thomas Muller is not like all the other straight-laced Agents because he was once inmate in Austria's prison system. It was only due to a crusading Appellate Judge and a Public Defender that believed in him that Muller ever saw the light of day again. While he may have been proven innocent, the stigma remained. Muller tries to clear the stain on his honor by hunting down criminals, putting those three years behind bars to good use. But Muller is starting to have doubts, as he and Detective Rohlstein solve murders and kidnappings in the old city of Vienna. Muller is starting to reconsider his efforts to clear his name after a series of chance occurrences in his last three cases.